Electrical condenser for ignition circuits



} 1,541,630 W. DUBILIER ELECTRICAL CONDENSER IGNITION CIRCUITS Jl me 9, 1925.

Filed April 22, 1924 INVENTOR ATTORNEY 'Patented June 9, 1925.

PATENT OFFICE.

WILLIAM DUBILIER, OF NEW YORK, N. Y., ASSIGNOR TO DUBILIER CONDENSER & RADIO CORPORATION, A CORPORATION OF DELAWARE.

ELECTRICAL CONDENSER FOR IGNITION CIRCUITS.

Application filed April 22, 1924. Serial No. 708,183.

To all whom it may concern:

Be it known that I, I/VI LIAM DUBILIER, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electrical Condensers for Ignition Circuits, of which the following is a specification.

This invention relates to electrical condensers; particularly condensers employed in electrical ignition circuits of internal combustion engines and for other purposes.

An object of my invention is to provide a novel, simple, practical and efficient condenser that can easily be mounted upon i nition magnetos or in position for use with other apparatus; such ma netos being in extensive use and are well nown, only the condenser need be herein illustrated and described.

Other objects and advantages will appear from the following description, and I reserve the right to make changes in the shape, size and arran ement of parts to the full extent indicated by the broad and general meanings of the terms of the appended claims.

In the accompanyin drawing,

Figure 1 is a view Iooking down on the top of a complete condenser, according to my invention;

Figure2 is a side view of the same;

Figure 3 is a view of the lower or terminal side of the condenser;

Figure 4 is a view of the body of the condenser; and

Figure 5 is an end view of the complete condenser.

The same characters of reference denote the same parts wherever they are shown.

Figures 1, 2, 3 and 5 show a design of a condenser for a magneto of the usual type. Heretof ore it has been customary to assemblc this kind of condenser by means of pins or rivets passing through the body of the condenser from one face to the other thereof. Such a construction has proven to be expensive and unsatisfactory, since to drill the mica/ sheets constituting the dielectric of the condenser, without starting minute cracks which cause punctures, short-circuits and other defects, is always a difficult pro needing.

In the practice of this invention, the structure of the condenser is simplified and improved, andits cost decreased; also the layers of mica or other insulation, and the sheets or plates of conductive material are not pierced or perforated; and the condenser is so made as to comprise a cover or casing, removable and replaceable, without taking the casing apart or even temporarily disturbing the terminals of the condenser.

In the drawings, 1 denotes a plate havin g an outwardly projecting stem 2, adapted to be secured to a part of the magneto, such as the armature, when the condenser is in place. This plate is of metal and is secured to a top plate 3,- of insulating material, by means of rivets 4, 5 and 6. Under one side or edge of the plate 1', and secured by the rivets 5, is adownwardly extending metallic side plate 7, adapted to be folded over the edge of the side of the. bottom plate 8 of insulation, being secured a ainst the face thereof by rivets 9 and 10. t the opposite side of the condenser is a metal plate 11, secured to plates 3 and 8 in a similar manner by means of rivets,12 and 13, 14 and 15 respectively.

It will now be observed that the plates 1, 7, and 11, with the plates 3 and 8 constitute a housing, cover or casing. The upper edge of the plate 7 is bent over to lie upon the upper face of the plate 3, under the plate 1, and the rivets 5 pass through all three plates 1, 3 and 7. Rivets 4 and 6 serve as additional fastening means to hold the plates 1 and 3 together; and the rivets with a core therein; the core being the side plate 7 to the bottom plate 8. At the same time the rivets 12, 13, 14. and 15 fasten the bent over edges of the other side plate 11 to the top and bottom plates and 8; and none of these rivets projects in beyond the inner surfaces of the plates 3 and 8, or. takes up any of the space between these two plates. Hence the core or stack of the condenser consisting of alternate sheets of conducting material and dielectric, imperiorate and continuous, that is, without openings or perforations, can very read1ly be inserted into the casing and dlsposed between the plates 3 and 8, and taken out by slipping-it through the'open ends of the casing, whenever removal 1s requ1red.

The lower edges of the side plates and 11,- bent overfil upon the outer face of the plate 8, have ,xtensions with projections 17 tlU and 16 respectively, these projections to serve as fastening lugs to grip the ends of conductors, and thus facilitate connecting the condenser into circuit.

A core is now made as shown detached in Figure and preferably consisting of a plurality of sections indicated by the terminals 18, 19 and 21, each section built up of alternate layers of tin foil and mica. These sections are placed together to form a stack or core of the necessary thickness and one half of the conducting layers are connected together by means of a metal plate or terminal 21 at one side of the core, and the remaining layers oi foil, (of opposite polarity), are joined to the metal plate 22 at the opposite side.

The complete core as shown in Figure t is then forced into the housing, where it occupies the position shown in Figures 2 and Terminals 21 and 22 are each soldered respectively to the side plates T and 11. This is preferably accomplished by forming the openings 23 and 2st in the plates 7 and 11, and filling them full of solder, although it is obvious that the core may be secured in the condenser casing in any suit .able manner. Hence, in case of damage,

the core may be removed by melting out the solder, without disassembling the condenser casing, since the core, when freed from its union with the plates 7 and 11, can easily be pushed out through the open ends of the casing. The side plate 11 may also be cut or stamped to afford a tongue 25 having an aperture 26. This tongue may be bent out to form a perforated lug, to receive a screw and co-operate with the stem 2, to enable the condenser to be mounted firmly in position upon the magneto carrying it.

As none of the layers of mica and tinfoil are perforated, the cost is greatlylessened, the stack is easier to make and can be built more quickly, and a superior and more finished, and more efiicient condenser, of greater durability and smaller liability to damage, is produced.

The plates 21 and 22 can be secured in any suitable way to the projecting edges of sheets of metal foil of opposite polarity, at the sides of the core; or be merely placed in contact therewith, and held tightly in place by the plates 7 and 11, when the core is thrust in the casing of the condenser.

lVhile l have shown and described the condenser of this invention as adapted for use in conjunction with magnetos, obviously the features of construction whereby the condenser-stack may be slipped in and out from between plates 3 and 8 are not limited to magneto condensers, but may be employed in condensers generally. In like manner the construction involving the means for holding the clips 11 to the plates 3 and 8 is of general application, and is adapted for use wherever it is desired to secure tightly together a condenser-stack comprising imperforate elements.

Since certain changes may be made in the above construction and diflerent embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a. limiting sense.

Having described my invention, what I believe to be new and desire to secure and protect by Letters Patent of the Jnited States is l. A condenser comprising a casing having top and bottom plates of insulation, separated side plates goining the top and bottom plates and providing terminals, a stack comprising layers of conducting and insulating material, and carrying a terminal for part of the layers of conducting material, and another terminal for the remaining layers of conducting material, the stack being capable of insertion as a unitinto the casing through either end thereof, to put each of its terminals into contact with one of the terminals of the-casing, and being removable from the casing.

2. A condenser comprislng a casing consisting of a top' plate of insulation, a plate having a stem, secured on the top plate, a bottom plate of insulation, separated side plates of metal attached to the top and bottom plates, the ends of the casing being open and the side plates forming terminals, and a stack of layers of insulating and conducting material having terminals for the layers of conducting material of opposite polarity, said lastnamed terminals including plates at each side of the stack, the stack being movable as a unit into the casing through either open end to put each terminal of the stack into connection with one terminal of the casing, the stack also being removable from the casing, the side plates of the casing being provided with extensions adjacent the bottom plate, the extensions having lugs to join the terminals to the conductors of an electric circuit.

3. A pondenser comprising a stack of conducting layers separated by insulation, cover plates for said stack, and a. plate at each side of the condenser, part of said layers being electrically connected to one of said side plates, and the remaining layers to the other side plate, each side plate having its opposite edges bent over upon the outer faces of said cover lates, said edges having fastening means or positively engaging said oover plates and securing said edges against same without projecting beyond the inner faces of the cover plates into said stack.

4. A condenser. eomprisi a stack of conducting layers separated y insulation, cover plates for said stack, and a plate at each side of the condenser, part of said layers being electrically connected to one of said side plates, and the remaining layers to the other side plate, each side plate having its opposite edges bent over upon the outer faces of said cover plates, said edges having fastening means for positively engaging said cover plates and securing said edges against same without .projecting beond the inner faces of the cover plates into said stack, one of the bent over edges of each side plate having an extension adjacent one end to enable the condenser to )e united to an electric circuit.

5. ,A condenser coinprisin a stack of conducting layers separated by insulation, relatively rigid insulating cover plates for said stack, and a deformable conducting plate at each side of the condenser, part of said layers bein electrically connected to one of said side p ates, and the remaining layers to the other side plate, each side plate having its opposite edges bent over upon the outer faces of said cover plates, said edges having fastening means and said cover plates having openings to receive said means to hold said edges against said cover plates, said means (being too short to project from the inner faces of said cover plates into said stack.

6. A condenser comprising a stack of conducting layers separated by insulation, relatively rigid insulating cover plates for said stack, and a deformable conducting plate at each side of the condenser, part of said layers being electrically connected to one of said side plates, and the remaining layers to the other side plate, each side plate having its opposite edges bent over upon the outer faces of said cover plates, said edges having fastening means and said cover plates having openings to receive said means to hold said edges against said cover plates, said means being too short to pro ject from the inner faces of said cover plates into said stack, one of the bent over edges of each plate having an extension adjacent one end to enable the condenser to be united to an electric circuit.

In testimony whereof I afiix my signature.

WILLIAM DUBILIER. 

